<template>
 <div>
  <button @click="handleClick" :disabled="disabled">
   {{btnText}}
  </button>
  <span>{{tip}}</span>
 </div>
</template>
<script>
 import moment from 'moment'
 export default {
  name: "Spike",
  props: {
   startTime: {
    required: true,
    validator: (val) => {
     return moment.isMoment(val)
    }
   },
   endTime: {
    required: true,
    validator: (val) => {
     return moment.isMoment(val)
    }
   }
  },
  data() {
   return {
    start: false,
    end: false,
    done: false,
    tip: '',
    timeGap: 0,
    btnText:""
   }
  },
   computed: {
   disabled() {
    //当三个异号的时候disable返回真，不可点击，
    // 初始化通过this.updateState确定disable的状态
    return !(this.start && !this.end && !this.done);
   }
  },
  async created() {
   const serverTime=await this.getServerTime();
   this.timeGap=Date.now()-serverTime;//当前时间和服务器时间差
   this.updateState();
   this.timeInterval=setInterval(()=>{
    this.updateState()
   },1000)
  },
  updated(){
   if(this.end||this.done){
    clearInterval(this.timeInterval)
   }
  },
  methods: {
   handleClick() {
    alert("提交成功");
    this.done=true;
    this.btnText="已参加过活动"
   },
   getServerTime() {
    //模拟服务器时间
    return new Promise((resolve, reject) => {
     setTimeout(() => {
      //当前时间慢10秒就是服务器时间
      resolve(new Date(Date.now() -10 * 1000).getTime())//跟本地时间差
     }, 0)
    })
   },
   updateState() {
    const now = moment(new Date(Date.now() - this.timeGap));//当前服务器时间
    const diffStart=this.startTime.diff(now);//开始时间和服务器时间之差
    const diffEnd=this.endTime.diff(now);//结束时间和服务器时间之差
    if(diffStart<0){
     this.start=true;
     this.tip="秒杀已开始";
     this.btnText="参加"
    }else{
     this.tip=`距离秒杀开始还剩${Math.ceil(diffStart/1000)}秒`;
     this.btnText="活动未开始";
    }
    if(diffEnd<=0){
     this.end=true;
     if( !this.btnText==="已参加过活动"||this.btnText==="参加"){
      this.tip="秒杀已结束";
      this.btnText="活动已结束";
     }
    }
   }
  },
  beforeDestroy() {
   clearInterval(this.timeInterval)
  }
 }
</script>
<style scoped>
 button[disabled]{
  cursor: not-allowed;
 }
</style>

<template>
 <div>
  <h1 style="color: red">设计一个秒杀倒计时的组件</h1>
  <Spike :startTime="startTime" :endTime="endTime"></Spike>
 </div>
</template>
<script>
 import Spike from './Spike'
 import moment from 'moment'
 export default {
  name: "index",
  components:{
   Spike
  },
  data(){
   return{
    endTime:moment(new Date(Date.now()+10*1000)),
    startTime:moment(new Date(Date.now()))
   }
  }
 }
</script>
<style scoped>
</style>

let goodsList = [{
 actEndTime: '2018-06-24 10:00:43'
}]
let endTimeList = [];
// 将活动的结束时间参数提成一个单独的数组，方便操作
 this.data.mydata.rush.forEach(o => {
   endTimeList.push(o.actEndTime)
})
 this.setData({
   actEndTimeList: endTimeList
});
 // 执行倒计时函数
 this.countDown();
timeFormat(param) { //小于10的格式化函数
  return param < 10 "tui-countdown-content {{(countDownList[index].day && countDownList[index].hou && countDownList[index].min && countDownList[index].sec) == 0">
        <text>剩余</text>
        <text class='tui-conutdown-box'>{{countDownList[index].day}}</text>
        <text>天</text>
        <text class='tui-conutdown-box'>{{countDownList[index].hou}}:</text>
        <text class='tui-conutdown-box'>{{countDownList[index].min}}:</text>
        <text class='tui-conutdown-box'>{{countDownList[index].sec}}</text>
       </view>
      </view>